Measurement-computing GPIB-488 Bedienungsanleitung PDF herunterladen (Seite 76)

Chapter 4 GPIB 488.2 Library Reference

Programming Reference Manual 4-8 GPIB-488

FindRQS

Identify the device requesting service.

Syntax

C FindRQS(int board, short addresslist[], short

*result)

Parameters

board is an integer which identifies the GPIB board to be used for this operation. In most

applications, this value is 0.

addresslist is an array of GPIB addresses, terminated by the value NOADDR. The devices

located at these addresses are serial polled until the one asserting SRQ is located.

Returns

result will contain the returned status byte of the device asserting SRQ.

ibcnt will contain the index (in addresslist) identifying the device's address.

ibsta will contain a 16-bit status word as described in Appendix B, IBSTA.

iberr will contain an error code, if an error occurred. iberr contains the error code ETAB,

if no device is requesting service. In this case,

ibcnt contains NOADDR's index.

iberr will contain the error code EABO if a device times out while responding to its serial

poll. In this case,

ibcnt contains the index of the timed-out device.

Usage Notes

None.

Example

Identifies which of the devices at GPIB addresses 6 and 7 (connected to board 0) is requesting

service.

short addresslist[3] = {6,7,NOADDR};

short result;

FindRQS (0, addresslist, &result);

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Measurement-computing GPIB-488 Bedienungsanleitung Seite 76